// @file binaryuniformgenerator.cpp This code provides generation of a uniform
// distribution of binary values (modulus 2). Discrete uniform generator relies
// on the built-in C++ generator for 32-bit unsigned integers defined in
// <random>.
// @author TPOC: contact@palisade-crypto.org
//
// @copyright Copyright (c) 2019, New Jersey Institute of Technology (NJIT)
// All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
// 1. Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
// 2. Redistributions in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation
// and/or other materials provided with the distribution. THIS SOFTWARE IS
// PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR
// IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
// EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
// INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
// ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

#include <random>
#include "math/binaryuniformgenerator.h"

namespace lbcrypto {

template <typename VecType>
std::bernoulli_distribution
    BinaryUniformGeneratorImpl<VecType>::m_distribution =
        std::bernoulli_distribution(0.5);

template <typename VecType>
typename VecType::Integer BinaryUniformGeneratorImpl<VecType>::GenerateInteger()
    const {
  return (m_distribution(PseudoRandomNumberGenerator::GetPRNG()) ? (1) : (0));
}

template <typename VecType>
VecType BinaryUniformGeneratorImpl<VecType>::GenerateVector(
    const usint size, const typename VecType::Integer &modulus) const {
  VecType v(size);
  v.SetModulus(modulus);

  for (usint i = 0; i < size; i++) {
    v.at(i) = GenerateInteger();
  }
  return v;
}

}  // namespace lbcrypto
